| 摘要 |
PROBLEM TO BE SOLVED: To highly accurately detect paper thickness without providing a dedicated sensor. SOLUTION: A PW detector 50 detecting the width of recording paper P on a platen 40 is mounted on a carriage 22. A reflection plate 42 is formed at an end of the platen 40 at approximately 45°of inclination with respect to the platen surface. The carriage 22 is moved to a position opposing to the reflection plate 42, and while the carriage 22 is moved by unit quantity, the carriage position from an optical sensor and voltage V from the PW detector 50 (light receiving element) are input to form a voltage waveform. Based on the width in which the carriage position where the voltage V exceeds a threshold value in the generated voltage waveform is continued, the paper thickness is determined. COPYRIGHT: (C)2011,JPO&INPIT
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